连词是一种虚词，不能担任一个句子成分。连词在句中主要起连接词与词、短语与短语及句子和句子的作用。它主要是包括并列连词和从属连词。
1、并列连词and和or：
①and和or是用得最多的并列连词，可以连接：
a.两个并列的动词：We were singing and dancing all evening.整个晚上我们都在唱歌跳舞。
b.名词、形容词等：This apple is big and red . Would you like fish or beef?
c.两个并列的分句(句子)：I said it and I meant it.我说话算数。
②and可连接两个分句，表示递进关系。Give him an inch and he will take a mile.他会得寸进尺。
③or可连接分句，表示"否则"：
Don't drive so fast or you'll have an accident.别开这么快，不然你会出车祸。
2、表示意思转折的连词：but,yet:
①but和yet的用法：
The weather will be sunny but cold.天气会晴朗但很冷。
It is strange , yet true.这很奇怪，却是真的。
②however,still等为副词，但可起连接作用，表示意思的转折---"但是"或"然而"。
a.however:His first response was to say no . Later , however , he changed his mind.
他的第一反应是不行，但后来他改变了主意。
b.still:It's raining;still I'd like to go.天在下雨，但我还是要去。
③词组all the same : She is naughty , all the same we have to laugh at her jokes.
她很调皮，但对她的恶作剧我们还是要发笑。
3、表示因果的连词：
①for可以表示"因为"，但引导的不是从句，而是并列分句，对前面情况加以解释，常用逗号把它和前面的分句分开，这在书面语中比较多见。
The days were short,for it was now December.白天很短，因为现在已经是十二月。
She must have gone out early , for she had not come for breakfast.
她肯定一早出去了，因为她没来吃早饭。
②so表示结果，可译为"因此"、"所以"。
Our cases were heavy , so we took a taxi.我们的箱子很重，因此我们坐了出租车
③therefore为副词，也表示同样的意思---"因此"，可放句前：
He had gone ; she therefo regave the money to me.他走了，于是她把钱给了我。
4、both...and的用法
A man should have both courage and perseverance.一个人既要有勇气又要有毅力。
5、就近原则：
1)neither…nor…Neither Lucy nor Lily is a League member.
2)not only…but also…Not only you but also he likes football.
3)either…or…EitherJimorPeterisright.
4)not…but…Not Jim but Peter broke the cup.
6、as well as的用法:
I have read one of his novels as well as a few of his plays.我读过他的一本小说和几个剧本。
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